Hello, i am using an I5 750 clocked to 3.8 ghz but according to core temp it usually just runs at around 2 ghz i'm amusing because it dems ti necessary to not use the full amount but for games would it not be better to have it running at 3.8 all the time?
Well, you won't really get better performance in the sense that it will clock back up to 3.8 GHz when you do use some CPU power, I don't think you'll see much of an improvement if SpeedStep is off (tbh, I'm not even sure if that's what's causing it to clock down to 2 GHz, but just an assumption). If you want to switch it off, you can do so in the BIOS.
Need more info - BIOS settings, voltages, base clock multiplier CPU features etc etc.
Anyway, EIST downlocks the CPU at idle and only at idle, if even one core is being used it will increase to whatever you set it to in the BIOS.
C1E/C States are completely different from EIST. They drop voltages and disable cores at idle. This saves power (idle power for my set up goes from something like 118 watts to 14W).
C States AND EIST are also mandatory if you're using Turbo Boost (which works by disabling unneeded cores (C States) and then boosting multiplier on the active ones (EIST))
IMO you should always keep these features on UNLESS they're causing issues. Save power, lower heat, reduce wear and tear.
Run either Prime95 or Intel Burn Test or some other stability testing software. This will max the CPU usage. Then tell us what it's at (or better yet take a screen shot with CPUZ and HWMonitor active)
1.4 idle = 133x9 which is the stock speeds at idle. "around 2ghz" is a bit vague but at 133bclk that's only 15 or 16 multiplier. Which means it's downclocked. Maybe you set a higher base clock and 15 multiplier, and then accidentally reset the bclk?
You might have CPU throttling occuring due to excessive heat. Are you using a stock CPU cooler??
For that frequency, your core voltage is way too high and so your core temps.
Agreed, I'm using 1.306V at 3.7ghz and with turbo on (4.2ghz) so that voltage is very excessive. novaen, if you're at a speed you're comfortable with you need to start lowering voltages and testing till you get the lowest usable voltage... obviously not a requirement, but it saves power, heat and CPU life (you can probably drop 10C)
Intel EIST Disabled
C1E Support Disabled
OC GENE Disable
Memory Ratio 4
QPF Ration 16
Load Line Calibration Disabled
CPU Voltage 1.280
Dram Voltage 1.600
Spread Spectrum Disabled
CPU base frequency 170
CPU Ratio 20
Would these settings suffice or should enable some of them?
I would also enable C1E, EIST, and C States. Those are only recommended to be disabled if they're causing trouble, which almost never happens unless you're going for extreme overclocking like over 4ghz. Obviously keeping them off isn't hurting anything... yet... but they're great to have to save power at idle and lower heat.